Masahiro Yamada 7ce7e984ab kbuild: rename cmd_{bzip2,lzma,lzo,lz4,xzkern,zstd22} ... GZIP-compressed files end with 4 byte data that represents the size of the original input. The decompressors (the self-extracting kernel) exploit it to know the vmlinux size beforehand. To mimic the GZIP's trailer, Kbuild provides cmd_{bzip2,lzma,lzo,lz4,xzkern,zstd22}. Unfortunately these macros are used everywhere despite the appended size data is only useful for the decompressors. There is no guarantee that such hand-crafted trailers are safely ignored. In fact, the kernel refuses compressed initramdfs with the garbage data. That is why usr/Makefile overrides size_append to make it no-op. To limit the use of such broken compressed files, this commit renames the existing macros as follows: cmd_bzip2 --> cmd_bzip2_with_size cmd_lzma --> cmd_lzma_with_size cmd_lzo --> cmd_lzo_with_size cmd_lz4 --> cmd_lz4_with_size cmd_xzkern --> cmd_xzkern_with_size cmd_zstd22 --> cmd_zstd22_with_size To keep the decompressors working, I updated the following Makefiles accordingly: arch/arm/boot/compressed/Makefile arch/h8300/boot/compressed/Makefile arch/mips/boot/compressed/Makefile arch/parisc/boot/compressed/Makefile arch/s390/boot/compressed/Makefile arch/sh/boot/compressed/Makefile arch/x86/boot/compressed/Makefile I reused the current macro names for the normal usecases; they produce the compressed data in the proper format. I did not touch the following: arch/arc/boot/Makefile arch/arm64/boot/Makefile arch/csky/boot/Makefile arch/mips/boot/Makefile arch/riscv/boot/Makefile arch/sh/boot/Makefile kernel/Makefile This means those Makefiles will stop appending the size data. I dropped the 'override size_append' hack from usr/Makefile. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Reviewed-by: Nicolas Schier <n.schier@avm.de>		2022-01-14 02:54:05 +09:00
..
include	kbuild: move headers_check.pl to usr/include/	2022-01-08 17:41:00 +09:00
.gitignore	.gitignore: prefix local generated files with a slash	2021-05-02 00:43:35 +09:00
default_cpio_list	initramfs: add default_cpio_list, and delete -d option support	2020-01-16 00:25:22 +09:00
gen_init_cpio.c	initramfs: Check timestamp to prevent broken cpio archive	2021-10-24 13:48:40 +09:00
gen_initramfs.sh	kbuild: replace LANG=C with LC_ALL=C	2021-05-02 00:43:35 +09:00
initramfs_data.S	initramfs: refactor the initramfs build rules	2020-01-16 00:26:21 +09:00
Kconfig	initramfs: Remove redundant dependency of RD_ZSTD on BLK_DEV_INITRD	2021-02-24 15:12:06 +09:00
Makefile	kbuild: rename cmd_{bzip2,lzma,lzo,lz4,xzkern,zstd22}	2022-01-14 02:54:05 +09:00